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| author | Juntong Deng <juntong.deng@outlook.com> | 2023-10-30 00:10:06 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-28 20:19:47 +0300 |
| commit | 08a28272faa750d4357ea2cb48d2baefd778ea81 (patch) | |
| tree | 3f071138834f6f53e6cc0eec0a54a3dd10a47a8c /fs | |
| parent | df8bc953eed72371e43ca407bd063507f760cf89 (diff) | |
| download | linux-08a28272faa750d4357ea2cb48d2baefd778ea81.tar.xz | |
gfs2: Fix slab-use-after-free in gfs2_qd_dealloc
[ Upstream commit bdcb8aa434c6d36b5c215d02a9ef07551be25a37 ]
In gfs2_put_super(), whether withdrawn or not, the quota should
be cleaned up by gfs2_quota_cleanup().
Otherwise, struct gfs2_sbd will be freed before gfs2_qd_dealloc (rcu
callback) has run for all gfs2_quota_data objects, resulting in
use-after-free.
Also, gfs2_destroy_threads() and gfs2_quota_cleanup() is already called
by gfs2_make_fs_ro(), so in gfs2_put_super(), after calling
gfs2_make_fs_ro(), there is no need to call them again.
Reported-by: syzbot+29c47e9e51895928698c@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=29c47e9e51895928698c
Signed-off-by: Juntong Deng <juntong.deng@outlook.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/gfs2/super.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 0dd5641990b9..5f4ebe279aaa 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -602,13 +602,15 @@ restart: } spin_unlock(&sdp->sd_jindex_spin); - if (!sb_rdonly(sb)) { + if (!sb_rdonly(sb)) gfs2_make_fs_ro(sdp); - } - if (gfs2_withdrawn(sdp)) { - gfs2_destroy_threads(sdp); + else { + if (gfs2_withdrawn(sdp)) + gfs2_destroy_threads(sdp); + gfs2_quota_cleanup(sdp); } + WARN_ON(gfs2_withdrawing(sdp)); /* At this point, we're through modifying the disk */ |